This Universal Stopper is a clear, surface mount cover with a blue horn housing, alarm, conduit spacer and remote contact. Cover is designed to comply with ADA and is less than 4 inches in depth. Other mounting options include a flush mount cover or a waterproof Type 4X enclosed backbox (Type rating pending). The cover is also available without a horn housing or message hood. Universal Stopper has the same footprint as the Mini Stopper , but has a larger interior and can accommodate most dual action pull stations.